What is the ph of your tap water? A stable ph is more important than trying to acheive the "perfect" ph. Are you doing anything to adjust your ph?
This is a tricky subject for me. I understand that a stable pH is important.
Water out of my tap is 7.2 (maybe 7)
If I let it sit for 24 hours it falls to 6.8. I was told this is normal "gassing out" by folks on this board.
I put a conditioner in my tank with water changes to neutralize the chlorine (I'm told by our LFS
that we don't have Chlormine in our tap water). This also lowers the Ph to 7 supposedly. It is called Neutral regulator by Sachem.
But my Tank water usually settles back to 6.8 after a day. I don't really know how to stabilize it. It goes in the tank through a python at 7.2, it goes down to 7 with the regulator and then falls to 6.8 as it gasses out.
I'm not doing large water changes (20 - 30%) so perhaps the 7.2 tap is going to dilute and not effect the whole tank. Perhaps the regulator is changing the whole tank from its seemingly natural 6.8 to 7. But somehow it falls back to 6.8. That seems to be where it always ends up.